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Finding the Fourth Proportional to 66.62, 91.65 and 54.32

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Solution

The fourth proportional to 66.62, 91.65 and 54.32 is: 74.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.62 : 91.65 = 54.32 : x
  2. Step 2: Convert to fraction form
    66.62/91.65 = 54.32/x
  3. Step 3: Cross multiply
    66.62x = 91.65 × 54.32
  4. Step 4: Simplify right side
    66.62x = 4,977.97
  5. Step 5: Solve for x
    x = 4,977.97/66.62
  6. Step 6: Final answer
    x = 74.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.